A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

The resting place of 18th century German mummies.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This historic stone bridge has an entire neighborhood clinging to its sides.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

Art and a pun, all in one.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Tiny memorials honor individual victims of the Holocaust.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

"The most colorful grottoes of the world.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

These 17th-century mummies are no longer naturally preserved, but remain on display today.